find intersection points and edge points

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majed majed
majed majed 2015-11-9
评论： Image Analyst 2019-10-29
As you see in figure, I have a binary image which has been thinned. It contains English letters, some letters have intersection points (marked with red circles), and some don’t have those.
I want to extract intersection points for every litter and put it in a cell or whatever. I also want to extract the edge points (marked with blue circles) and put it in a cell or matrix to use it later.
In fact I have tried to write function but I could not execute it. So I hope that our teachers here help me.
Note: intersection points are pixels have more than two pixels in a neighborhood, while edge points have just one pixel.
Thank you
  2 个评论
Puja Das
Puja Das 2019-10-29
I want the code please send me puja250196@gmai.com
Image Analyst
Image Analyst 2019-10-29
Puja: Did you scroll down to here? Source code is there. Why email it to you when you can get it right there?

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采纳的回答

Image Analyst
Image Analyst 2015-11-10
This functionality is built into the bwmorph() function:
bpImage = bwmorph(binaryImage, 'Branchpoints');
epImage = bwmorph(binaryImage, 'Endpoints');
% Plot blue circles over branchpoints
[ybp, xbp] = find(bpImage);
hold on;
plot(xbp, ybp, 'bo', 'MarkerSize', 15);
% Plot red circles over endpoints.
[yep, xep] = find(epImage);
hold on;
plot(xbp, ybp, 'ro', 'MarkerSize', 15);
  3 个评论
显示 1更早的评论
swathi
swathi 2018-8-31
What modification should be brought in the given code, for image with white background & signature in black. Please help
swathi
swathi 2018-8-31
I mean, to obtain the end points of the signature, where in, image has white background & signature in black. Kindly help.

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更多回答（1 个）

Robert
Robert 2015-11-10
Attached i send you a m.file. It finds the edge points right. For the intersection points, there is still some error, but the file can maybe help you as a draft.
Regards, Robert

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